add @html-eslint plugin, bump typescript, typescript-eslin

Author: yeonjuan

.eslintrc.js

@@ -11,4 +11,16 @@ module.exports = {
   rules: {
     "@typescript-eslint/ban-ts-comment": "off",
   },
+  overrides: [
+    {
+      files: ["*.html"],
+      plugins: ["@html-eslint"],
+      parser: "@html-eslint/parser",
+      rules: {
+        "@html-eslint/require-lang": "error",
+        "@html-eslint/require-title": "error",
+        "@html-eslint/no-multiple-h1": "error"
+      }
+    },
+  ],
 };

package-lock.json

@@ -35,8 +35,8 @@
   },
   "homepage": "https://github.com/yeonjuan/typescript-eslint-demo#readme",
   "dependencies": {
-    "@typescript-eslint/eslint-plugin": "4.6.0",
-    "@typescript-eslint/parser": "4.6.0",
+    "@typescript-eslint/eslint-plugin": "4.9.0",
+    "@typescript-eslint/parser": "4.9.0",
     "bootstrap": "^4.5.2",
     "codemirror": "^5.58.1",
     "core-js": "^3.6.5",
@@ -47,13 +47,15 @@
     "react": "^16.13.1",
     "react-bootstrap": "^1.3.0",
     "react-dom": "^16.13.1",
-    "typescript": "4.0.5"
+    "typescript": "4.1.2"
   },
   "devDependencies": {
     "@babel/core": "^7.11.6",
     "@babel/preset-env": "^7.11.5",
     "@babel/preset-react": "^7.10.4",
     "@babel/preset-typescript": "^7.10.4",
+    "@html-eslint/eslint-plugin": "^0.6.5",
+    "@html-eslint/parser": "^0.6.0",
     "@types/codemirror": "0.0.98",
     "@types/eslint": "^7.2.4",
     "@types/jest": "^26.0.14",